Audacity 1.2.x and 1.3.x are obsolete and no longer supported. If you still have those versions, please upgrade (see https://www.audacityteam.org/download/).The old forums for those versions are now closed, but you can still read the archives of the 1.2.x and 1.3.x forums.

OK, so that gives us two lines of enquiry.If I can reproduce the problem with your 'bad' project, then it's a problem in our code (Audacity should at least be able to fail gracefully even if the data is bad).If I can't reproduce the problem, then it's more likely to be a problem with that particular build of Audacity, so we can then look into that.